My first blog post ever. What's a blog?

Just learning what this whole blog thing is about. Looks like it could be a valuable tool for my real estate website. For those of you that are not familiar with what a blog is, here is a definition from dictionary.com (blog is short for weblog):

Main Entry: weblog
Part of Speech: noun
Definition: a personal Web site that provides updated headlines and news articles of other sites that are of interest to the user, also may include journal entries, commentaries and recommendations compiled by the user; also written web log, Weblog; also called blog
Usage: computing